WTF/std normalization: replace WTF::Vector::first() with ::front()

mojo/public/cpp/bindings/wtf_array.h

Index: mojo/public/cpp/bindings/wtf_array.h
diff --git a/mojo/public/cpp/bindings/wtf_array.h b/mojo/public/cpp/bindings/wtf_array.h
index 46d9a6958bd658145761b1d7359993bc06cea57c..5964f2a4c9d985147a64b1e112d48d1b2fa13778 100644
--- a/mojo/public/cpp/bindings/wtf_array.h
+++ b/mojo/public/cpp/bindings/wtf_array.h
@@ -88,8 +88,8 @@ class WTFArray {
 
   // Returns a reference to the first element of the array. Calling this on a
   // null or empty array causes undefined behavior.
-  const T& front() const { return vec_.first(); }
-  T& front() { return vec_.first(); }
+  const T& front() const { return vec_.front(); }
+  T& front() { return vec_.front(); }
 
   // Returns the size of the array, which will be zero if the array is null.
   size_t size() const { return vec_.size(); }